radar
/'reidə/
Học thuậtThân thiện
Definition
- Noun:
- A device or system for detecting objects: A measuring instrument that uses the echo of a pulse of microwave radiation to detect and locate distant objects, determining their direction, distance, or speed.
- The field or technology related to such devices: The general science, method, or use of such detection systems.
Usage Examples
- Noun:
- The ship's radar detected an object on the horizon.
- Air traffic control relies heavily on radar to track aircraft.
- The storm was visible on the weather radar.
Advanced Usage
- "To fall off the radar": To cease to be noticed, discussed, or considered important.
- After his first album, the singer fell off the radar for several years.
- "To be on someone's radar": To be within the scope of someone's attention or awareness.
- That emerging technology is definitely on our company's radar.
- "Radar screen": Literally, the display screen of a radar system; figuratively, the sphere of attention or concern.
- The new competitor has just appeared on our radar screen.
Variants and Related Words
- Radar gun (n): A handheld radar device used to measure the speed of moving objects, especially vehicles or pitched baseballs.
- Radar trap (n): A section of road where police use radar to detect speeding vehicles.
- Radarscope (n): The cathode-ray tube display screen in a radar set.
Synonyms
- Detection system: A general term for any apparatus designed to discover the presence of something.
- Sonar: A similar system that uses sound waves (typically underwater) rather than radio waves.
Related Phrases
- Under the radar: Done secretly or without attracting attention.
- The company launched the product under the radar to avoid early competition.
Noun
- measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects